perf kvm: Use histograms list to replace cached list

perf kvm tool defines its own cached list which is managed with RB tree,
histograms also provide RB tree to manage data entries.  Since now we
have introduced histograms in the tool, it's not necessary to use the
self defined list and we can directly use histograms list to manage
KVM events.

This patch changes to use histograms list to track KVM events, and it
invokes the common function hists__output_resort_cb() to sort result,
this also give us flexibility to extend more sorting key words easily.

After histograms list supported, the cached list is redundant so remove
the relevant code for it.

Committer notes:

kvm_hists__reinit() is only used by functions enclosed in:

  #if defined(HAVE_KVM_STAT_SUPPORT) && defined(HAVE_LIBTRACEEVENT)

So do it with this new function as well.

Signed-off-by: Leo Yan <leo.yan@linaro.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Garry <john.g.garry@oracle.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: linux-arm-kernel@lists.infradead.org
Link: https://lore.kernel.org/r/20230315145112.186603-2-leo.yan@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 0 insertions, 7 deletions

diff --git a/tools/perf/util/kvm-stat.h b/tools/perf/util/kvm-stat.h
index fc30a72dfac1..3f0cbecb862c 100644
--- a/tools/perf/util/kvm-stat.h
+++ b/tools/perf/util/kvm-stat.h
@@ -36,7 +36,6 @@ struct perf_kvm_stat;
 
 struct kvm_event {
 	struct list_head hash_entry;
-	struct rb_node rb;
 
 	struct perf_kvm_stat *perf_kvm;
 	struct event_key key;
@@ -81,9 +80,6 @@ struct exit_reasons_table {
 	const char *reason;
 };
 
-#define EVENTS_BITS		12
-#define EVENTS_CACHE_SIZE	(1UL << EVENTS_BITS)
-
 struct perf_kvm_stat {
 	struct perf_tool    tool;
 	struct record_opts  opts;
@@ -103,7 +99,6 @@ struct perf_kvm_stat {
 
 	struct kvm_events_ops *events_ops;
 	key_cmp_fun compare;
-	struct list_head kvm_events_cache[EVENTS_CACHE_SIZE];
 
 	u64 total_time;
 	u64 total_count;
@@ -112,8 +107,6 @@ struct perf_kvm_stat {
 
 	struct intlist *pid_list;
 
-	struct rb_root result;
-
 	int timerfd;
 	unsigned int display_time;
 	bool live;